Sinu-Atrial Node of Mature Dromedary Camel Heart (Camelus dromedarius) with Special Emphasis on the Atrial Purkinje Like Cardiomyocytes
Cell Biology
Volume 3, Issue 2, March 2015, Pages: 25-33
Received: Feb. 28, 2015; Accepted: May 5, 2015; Published: May 13, 2015
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Authors
Wael Ghonimi, Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
Ahmad Balah, Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
Mohamed Hafez Bareedy, Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
Hoda Fa Salem, Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
Shehata Mm Soliman, Department of Histology and Cytology, Faculty of Veterinary Medicine, Minia University, Minia, Egypt
Ahmad Elbaz, Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
Amr Helal, Department of Anatomy and Embryology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
Ahmad Awad Abuel-Atta, Department of Histology and Cytology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt
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Abstract
The sinu-atrial node (SAN) is one of the impulse conducting system of the camel heart. Anatomically, it lies beneath the epicardium, at the cranial end of the terminal sulcus, near the junction between the superior vena cava to the lateral wall of the right atrium and the right auricle. Histologically, SAN is located in the subepicardial layer of the terminal crest and can be identified as a mass of specialized and modified cardiac myocytes. Moreover, it appeared elongated in shape and bent oblong. SAN appears strongly similar to the general structure of the glands where, it is formed of two parts; the stroma and the parenchyma. The stroma is consisted of a fibrous connective tissue capsule that is completely investing the SAN from all sides. From the capsule, thin connective tissue septa or trabeculae are extending to inside the node, dividing the later into lobes. These lobes form the SAN head or the SAN body. From this body, the SAN arms processes take their way out. These arms are considered the internodal and interatrial pathways to the different sites in the right and left atria. So, the SAN head with arms giving the octopus like-appearance for the node. The parenchyma is consisted of three different types of specialized and modified cardiac myocytes; the perinuclear clear zone cells (“P” cells), the transitional cells (“T” cells) and the atrial Purkinje like cells or Purkinje like conducting cells.
Keywords
Sinus Node, Perinuclear Clear Zone Cells, Transitional Cells, Atrial Purkinje Like Cells, Heart, Dromedary Camel, SAN
To cite this article
Wael Ghonimi, Ahmad Balah, Mohamed Hafez Bareedy, Hoda Fa Salem, Shehata Mm Soliman, Ahmad Elbaz, Amr Helal, Ahmad Awad Abuel-Atta, Sinu-Atrial Node of Mature Dromedary Camel Heart (Camelus dromedarius) with Special Emphasis on the Atrial Purkinje Like Cardiomyocytes, Cell Biology. Vol. 3, No. 2, 2015, pp. 25-33. doi: 10.11648/j.cb.20150302.11
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